Attachment for firearms



March 21, 1939. A. F. GAIDOS ATTACHMENT FOR FIREARMS Filed Jan. 15. 1935 2 Sheets-Sheet 1 v INVNTOR. ALo/vzo E GA/D 0.:

A TTORNE YS.

March 21, 1939. A. F. GAIDOS V 2,150,914

ATTACHMENT FOR FIREARMS Filed Jan. 15, 1935 2 Sheets-Sheet 2 A TTORNE Y5.

Patented Mar. 21, 1939 barren "rates arar rrica 16 Claims.

This invention relates to auxiliary attachlarly for revolver-s of thesingle or double action types for quickly and conveniently transforming firearm designed to shoot center fire ammunition, to an armutilizinginexp nsi ve nmgfire ammunition, such as the standar commercial .22 caliber cartridges.

Another object of the present invention is to generally improve and simplify the construction and operation of repeating auxiliary attachments for revolving firearms by fitting such arms conveniently with sub-caliber barrels and means to utilize rim-fire ammunition which may be fired by the center-fire mechanism of the firearm.

Any firearm so fitted may be employed for economical target practice or for hunting of small game which large caliber cartridges would blow 5 to pieces.

Another object and advantage will be apparent during the course of the following description.

The invention is shown by way of illustrations in the accompanying drawings in which:

Figure 1 is a side view of a-revolving type of firearm of the swing-out cylinder magazine type.

Figure 2 is a partial longitudinal cross section of the mechanism.

Figure 3 is a rear view of the firing-pin block.

Figure 4 is a section through 4--4 of Fig. 2.

F gure 5 is a side view of the cylinder magazine units in the act of ejecting fired cartridge cases.

Figure 6 is'a rear View of a swing-out cylinder type of firearm fitted with my device.

Figure 7 is a side view of a breakopen type of revolving firearm fitted with my device.

Figure 8 is a side view of a solid frame, ejectorrod type of firearm fitted with an alternate arrangement of my caliber device.

Figure 9 is a rear view of firing-pin block for use on a firearm of the type shown in Figure 8.

Referring more particularly to Figure 1, I provide a sub-caliber tube i, having an enlarged knurled portion 2. on one end and a threaded por- 50 tion 3. on the other end. The sub-caliber tube i,

is inserted from the muzzle end of the arm until it comes to rest on shoulder 2', of the sub-caliber tube I. A lock nut 4, engages threaded portion 3.

on opposite end and securely retains the tube I. 55 in the barrel of the arm.

ment with the sub-caliber tube II.

' around each hole l9.

I then provide a cylinder 5, having bored holes 6. equally spaced around a circle to receive rimfirecartridges i, so that they are in proper align- I also provide an ejector plate 8, secured to the enlarged end 5 13. of an ejector rod [3' by-means of a pin l0.

The ejector rod 13 is slidably mounted in the swinging crane it, the upper portion of which terinmates in a tubular section ii. Around the enlarged portion i3, of the ejector-rod i3 is freely 10 mounted a coiled spring i2, of the compression type. one end of which rests against a shoulder 15 of the ejector-rod IS, the other end resting against a threaded closure ring i6, screwed into the tubular section Ii, of the crane I4. 15 I also provide an aligning pin ii) on the ejector plate 8 to insure proper alignment of the plate 8 with the cartridge chambers ii, when it is returned to position after ejecting the cartridges. The ejector plate 8 is placed in a recess or coun- 20 ter sunk bore in the adjacent face of the cylinder 5.

I also provide a firing-pin block i7, into which is counter-bored a. hole l8, to receive the hub 8' of the ejector plate 8. In the firing-pin block ll, are provided holes Hi, to receive plunger firingpins 20, which are slidably retained by a crimp 2 i,

A compression spring 22, is provided to return the plunger firing-pin 2U, 30 to the proper position. It will be noted that each plunger 20 is so formed that when struck by the hammer 23. of the firearm at a projecting'point 24, the blow will be transferred through an on center projection 27' at the other end of the 5 plunger 20 to the rim 1'- of the cartridge 7,

thus exploding the charge. The firing pin block H, is provided with a usual ratchet 26, which is actuated by the hand in the revolving mechanism of the firearm. 40 To properly align the firing-pin block ll, 50 that each plunger 20 is directly over a cartridge 1. I provide a locating pin 21 fixed in the block ll, to freely engage a register hole 28, in the cylinder magazine 6. a

The firing pin block H, has the conventional register stops 30, spaced-around its periphery to align'the cylinder openings 6, with tube 1. I also provide the block i! with a relief portion 29. to clear the stop-lug 29 on the frame of the firearm. Thus it will be noted that when the cylinder is in the swung-open position as shown in Figure 6, and rotated so that notch 29, is opposite stop-lug 29', the block ll, may be convenlently detached from the cylinder 5, for the 55 a u. u

. as described is a self-contained unit and may be lar to plungers 30.

provided to retain the block 3|, in a fixed position readily substituted by a cylinder and crane unit of the firearm for which it is designed.

I also wish it understood that my invention may be incorporated for revolving firearms of all types such as those shown in Figure '7, and Figure 8. In the break open type shown in Figure 7, my device is the same as in the swinging crane type, heretofore described. In Figures 8 and 9, which illustrate a solid frame ejector-rod type of firearm, I provide a similar arrangement to that shown, with the exception of omitting the ejector plate 8, and providing a firing pin block 3i. having openings 32, between plungers 33, so that the cartridges may be ejected from the cylinders 34, through openings 32, of block 3|. There is one such opening 32 between each pair of adjacent plungers 33. Said plungers 33 are arranged simi- A locking mechanism 35, is

while ejecting or loading cartridges. This locking mechanism 35 in the herein illustration includes a latch 35 slidable on the side of the block 3i, and a pair of keeper notches 3! and 38 on the cylinder 5 to be engaged by the latch 38, respectively when the plungers 20 or the openings 32 are held in alignment with the cartridges 1.

While certain features of my invention are more or less specifically described, I wish it understood that various changes may be resorted to within the scope of the appended claims. Similarly, that the materials and finish oi the several parts employed may be such as the manufacturer may decide on, or varying conditions or uses may demand.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. An auxiliary cylinder for firearms with revolving cylinders, comprising a cylinder with holes to hold sub-caliber ammunition, a separate and detachable firing-pin block on the firing end of the cylinder. and a plurality of firing-pins in the bloclc operatively aligned with the respective ammunition in the holes of the cylinder and being adapted to transmit an impact from a firing mechanism of said firearm to the respective amrmmition.

2. An auxiliary cylinder for firearms with re- I volving cylinders, comprising a cylinder with holes to hold sub-caliber ammunition, a separate firingpin block on the firing end of the cylinder, and a plurality oi firing-pins in the block operatively aligned with the respective ammunititon in the holes of the cylinder and being adapted to transmit an impact from a firing mechanism of said firearm to the respective ammunition, said firingpin block being detachably held on said cylinder.

3. An auxiliary cylinder for firearms with revolving cylinders, comprising a cylinder with holes to hold sub-caliber ammunition, a separate firingpin block on the firing end of the cylinder, a plurality of firing-pins in the block operatively aligned with the respective ammunition in the holes of the cylinder and being adapted to transmit an impact from a firing mechanism of said firearm to the respective ammunition. and means for aligning the firing-pin block with the holes of said cylinder.

4. An auxiliary cylinder for firearms with revolving cylinders, comprising a cylinder with holes to hold sub-caliber ammunition, a firing-pin block on the firing end of the cylinder, a plurality of firing-pins in the block operatively aligned with the respective ammunition in the holes of the cylinder so as to transmit an impact from a firing mechanism of said firearm to the respective ammunition, an ejector plate disposed between the end of the cylinder and the firing-pin block, and means whereby the ejector plate can be manipulated to move said firing pin block away from the end of the cylinder and to eject said ammunition from said holes.

5. An auxiliary cylinder for firearms with revolving cylinders, comprising a cylinder with holes to hold sub-caliber ammunition, a firing-pin block on the firing end of the cylinder, a plurality of firing-pins in the block operatively aligned with the respective ammunition in the holes of the cylinder so as to transmit an impact from a firing mechanism oi said firearm to the respective ammunition, an ejector plate disposed between the end of the cylinder and the firing-pin block, and meanswhereby' the ejector plate can be manipulated for simultaneously moving said block away from said cylinder and ejecting said ammunition from said cylinder, said ejector plate being centrally located relatively to and being recessed into said end of the cylinder.

6. The combination with a cylinder for a firearm having holes-to contain ammunition, of a firing-pin block at the end of the cylinder adjacent the firing mechanism of the firearm, a plurality of rim-fire firing pins in said block being aligned with the holes of the cylinder, said pins being adapted to be actuated by a center fire firing mechanism of the firearm, and means for moving said firing block relatively to said cylinder and to simultaneously eject the ammunition or shell from said cylinder.

7. The combination with a cylinder for a firearm having chambers to contain ammunition and an ejector element adapted to be extended through the respective chambers to eject the ammunition therefrom, of a firing block on an end of the cylinder, firing pins in said block to transmit the action of the firing mechanism of the firearm to said ammunition, said block being apertured in ofiset relation to said pins to allow the ejection of the ammunition through the firing block when the block is shifted to align its aperture with the respective chambers of the cylinder.

.8. The combination with a cylinder for a firearm having chambers to contain ammunition and an ejector element adapted to be extended through the respective chambers'to ejectthe ammunititon therefrom, of a firing block on an end of the cylinder, firing pins in said block to transmit the action of the firing mechanism of the firearm to said ammunition, said firing block hav-- ing a set of holes therethrough corresponding to the chambers in the cylinder and being offset relatively to the firing-pins, saidfi'ring block being adapted to' be adjusted for selective alignment of either said firing-pins or said holes with the respective chambers of the cylinder, said holes being adapted to allow ejection of ammunition therethrough.

9. The combination with a cylinder for a firearm having chambers to contain ammunition and -an ejector element adapted to'be extended through the respective chambers to eject the ampins to allow the ejection of ammunition when the firing block is adjusted so as to bring the holes of the firing block into alignment with the chambers of the cylinder, and means to selectively hold the firing block relatively to said cylinder either with the firing pins or with holes of the block in registry with the chambers of the cylinder.

10. The combination with a magazine [or a firearm adapted to hold ammunition in operative relation to the barrel of the firearm, and a firing mechanism of said firearm, of a removable firingpin block at the end of the magazine adjacent said firing mechanism, a plurality of firing pins in said block being aligned with said ammunition in the magazine, said pins being adapted to transmit the usual impact of said firing mechanism to said ammunition.

11. The combination with the usual barrel of a revolver having means behind the barrel to support a usual cylinder between a firing mechanism and the barrel, and a sub-caliber barrel adapted to be arranged in said usual barrel, of a cylinder having permanent sub-caliber chambers therein taking the place of said usual cylinder and fitting between the sub-caliber barrel and said firing mechanism, a block detachably arranged on the end of said sub-caliber cylinder adjacent said firing mechanism, a plurality of auxiliary firing mechanisms supported as a unit in said block, and means to align said block so that each auxiliary firing mechanism is in registry with a chamber of said sub-caliber cylinder.

12. The combination with the usual barrel of a revolver having means behind the barrel to support a usual cylinder between a firing mechanism and the barrel, and a sub-caliber barrel adapted to be arranged in said usual barrel, of a cylinder having permanent sub-caliber chambers therein taking the place of said usual cylinder and fitting between the sub-caliber barrel and said firing mechanism, a plurality of auxiliary firing mechanisms supported on said block in registry with the respective chambers of said sub-caliber cylinder, each of said auxiliary firing mechanisms being adapted to convert the action of the usual firing mechanism of said revolver to rim firing action on the sub-caliber ammunition in the chambers of said sub-caliber-cylinder.

13. The combination with a revolver of the character described, and a sub-caliber barrel adapted to be arranged in the usual barrel of said revolver, of an auxiliary cylinder for replacing the usual cylinder of said revolver and having subcaliber chambers therein, a plurality of auxiliary firing mechanisms, a separate clement movable relatively to said auxiliary cylinder to support all of said auxiliary firing mechanisms as a unit in alignment with the respective chambers of said auxiliary cylinder, and ejector means to move said element and said auxiliary firing mechanisms as a unit when the shells of the ammunition, are ejected from said chambers.

ii. The combination with the usual barrel of a revolver having means behind the barrel to support a usual cylinder between a firing mechanism and the barrel, and a sub-caliber barrel, of a cylinder having sub-caliber chambers therein taking the place of said usual cylinder, said sub-caliber chambers being shorter than the usual cylinder so as to fit sub-caliber ammunition in length, means to extend the throat of the sub-caliber barrel to one end of said chambers in firing position, and means between the other end of said sub-caliber cylinder and the firing mechanism to transmit the firing action of the latter to the individual chambers.

15. In a device of the character described the combination with the barrel, the frame and the firing mechanism of a revolver, of a sub-caliber barrel detachabiy arranged in said barrel, a cylinder having sub-caliber chambers therein being arranged in place of the usual cylinder on said frame, said sub-caliber chambers being shorter than the chambers of the usual cylinder of said revolver so as to conform to the length oi subcaliber ammunition, means to extend the throat of the sub-caliber barrel to an end of said chambers in firing position, and means between the cylinder and the firing mechanism to extend the action of said firing mechanism individually to the other end of said sub-caliber chambers.

16. In a device of the character described, the combination with the usual barrel, the frame and the usual firing mechanism of a revolver, the distance between the throat of said usual barrel and said firing mechanism normally accommodating a usual caliber cylinder; of a sub-caliber barrel detachably arranged in said usual barrel, 2. subcalibcr cylinder arranged in place of the usual cylinder on said frame between said sub-caliber barrel and said firing mechanism, said sub-caliber cylinder having sub-caliber chambers therein, each sub-caliber chamber being substantially oi the same length as the sub-caliber ammunition used therein but shorter than saidnormal cylinder, means at the throat of the sub-caliber barrel to extend the same to the end of the sub-caliber chambers in firing position in axial alignment with said chambers, and auxiliary firing mechanism between the other end of the sub-caliber cylinder and said firing mechanism to transmit and extend the action of the normal firing mechanism through the space between said chambers and the normal firing mechanism to the subcaliber ammunition in said chambers.

ALONZO F. GAIDOS. 

